Formation of Al-rich nanocrystalline ZSM-5 via chloride-mediated, abrupt, atypical amorphous-to-crystalline transformation

Vanessa B. Mortola, Adriana P. Ferreira, Joseph M. Fedeyko, Christopher Downing, Jose M.C. Bueno, Mayfair C. Kung, Harold H. Kung

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The efficient hydrothermal synthesis of highly crystalline, nano ZSM-5 particles, rich in framework Al content (Si/Al = 25) and low in the degree of intergrowth, in a medium of unusually high NaCl concentration was followed by examining the solids formed with 29Si, 27Al, 13C MAS NMR, TEM, DRIFT, and XRD spectroscopies. ZSM-5, in the form of 60 nm primary crystallites present as 100-150 nm dispersed cubic clusters, were crystallized from an amorphous phase via an abrupt, solid state transformation within 15 min at 165 °C. A model of the crystallization process was proposed, different from the typical nucleation-crystal growth process, in which aluminosilicate oligomers of low connectivity was salted out as amorphous solid as a result of high NaCl concentration immediately upon mixing of the ingredients.

Original languageEnglish
Pages (from-to)7517-7525
Number of pages9
JournalJournal of Materials Chemistry
Issue number35
Publication statusPublished - Sep 21 2010


ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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